EP1052949A1 - Hip joint socket - Google Patents

Hip joint socket

Info

Publication number
EP1052949A1
EP1052949A1 EP98965817A EP98965817A EP1052949A1 EP 1052949 A1 EP1052949 A1 EP 1052949A1 EP 98965817 A EP98965817 A EP 98965817A EP 98965817 A EP98965817 A EP 98965817A EP 1052949 A1 EP1052949 A1 EP 1052949A1
Authority
EP
European Patent Office
Prior art keywords
coating
acetabular cup
cup according
hip joint
bearing shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98965817A
Other languages
German (de)
French (fr)
Other versions
EP1052949B1 (en
Inventor
Wilfried Von Chamier
Hartmut Kälberer
Hans-Georg Pfaff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of EP1052949A1 publication Critical patent/EP1052949A1/en
Application granted granted Critical
Publication of EP1052949B1 publication Critical patent/EP1052949B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/28Materials for coating prostheses
    • A61L27/30Inorganic materials
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/3094Designing or manufacturing processes
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30451Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30906Special external or bone-contacting surface, e.g. coating for improving bone ingrowth shot- sand- or grit-blasted
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30925Special external or bone-contacting surface, e.g. coating for improving bone ingrowth etched
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2002/30929Special external or bone-contacting surface, e.g. coating for improving bone ingrowth having at least two superposed coatings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0058Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005The prosthesis being constructed from a particular material
    • A61F2310/00179Ceramics or ceramic-like structures
    • A61F2310/00185Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00203Ceramics or ceramic-like structures based on metal oxides containing alumina or aluminium oxide
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389The prosthesis being coated or covered with a particular material
    • A61F2310/00395Coating or prosthesis-covering structure made of metals or of alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389The prosthesis being coated or covered with a particular material
    • A61F2310/00395Coating or prosthesis-covering structure made of metals or of alloys
    • A61F2310/00407Coating made of titanium or of Ti-based alloys
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00389The prosthesis being coated or covered with a particular material
    • A61F2310/00592Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
    • A61F2310/00796Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2430/00Materials or treatment for tissue regeneration
    • A61L2430/24Materials or treatment for tissue regeneration for joint reconstruction

Definitions

  • the invention relates to an acetabular cup of a hip joint endoprosthesis in accordance with the preamble of the first claim.
  • Hip joint endoprostheses are generally modular. For example, they consist of a shaft that is inserted into the thigh bone. A spherical head is attached to the shaft, which is stored in a pan made up of two parts. The pan consists of a pan housing, the so-called metal back, and a pan insert, the so-called insert. There are also systems that allow even more combination and variation options, for example to extend the shaft. In the modular endoprostheses, implant components of different materials and sizes are connected to each other.
  • ball heads made of cobalt-chrome are placed on a shaft made of titanium alloy, or a socket insert made of polyethylene or a ceramic material is inserted into a socket housing, as is known, for example, from DE 196 112 48 A1.
  • the combination of the individual parts is usually determined by the joint dimensions.
  • the object of the present invention is to present an acetabular cup of a hip joint endoprosthesis in which an incorrect composition of the socket insert and socket housing is excluded and a stress-related loosening of the two components is prevented.
  • the invention creates a one-piece acetabular cup as an implant.
  • a biocompatible metal or a biocompatible metal alloy in the area in which the socket is inserted into the hip bones, an inseparable connection is created between the part of the prosthesis that, according to the prior art, is used to support the ball head acts as an insert and the so-called socket housing, which creates the connection between the bone and the bearing shell for the ball head.
  • the surgeon is thus only provided with a part for the implantation of a cup, the coating being optimally matched to the size and composition of the ceramic bearing shell.
  • the risk of incorrect assembly of the pan insert and pan housing is excluded. Also excluded is the risk that the connection between insert and housing will loosen due to the loads in the prosthesis joint and the prosthesis will wear out due to a relative movement of the two components against one another.
  • the surface of the bearing shell of the acetabular cup to be coated is roughened. This ensures an intimate and firm mechanical connection of the coating to the ceramic body, since the coating is neither chemically nor metallurgically associated with the Ceramic reacts.
  • the surface of the ceramic body can be roughened, for example, by blasting with hard material particles, by coarse grinding or by etching.
  • the coating is evaporated.
  • the vapor deposition can be done, for example, by sputtering.
  • the metal to be applied is atomized in a high vacuum and deposits from the vapor phase on the surface of the substrate.
  • a coating of the required layer thickness can be produced by multiple vapor deposition.
  • the coating can also be sprayed on.
  • Plasma spraying is suitable for spraying on metals or metal alloys, in particular high-melting metals or metal alloys of titanium.
  • Plasma spraying also offers the possibility of producing a coating in the required thickness. With a coating of sufficient thickness, it is possible to roughen the surface of the coating. The roughness can be brought about by the application process or by appropriate post-processing in such a way that the bone tissue has the possibility of growing together with the surface and thus causing the implant to be securely anchored in the bone. The quality of the surface can already be achieved by the spraying technique, in particular in the case of plasma spraying, so that no post-processing is required.
  • the implant is particularly well anchored in the bone tissue if the coating is porous.
  • the bone tissue can grow into the pores and thus give the implant a particularly good hold.
  • the thickness of the coating must be selected so that on the one hand it offers the bone tissue a sufficiently large contact surface for growth, but on the other hand it is not at risk of breakage, which can be the case, for example, if the porous coating is too thick.
  • a layer thickness that is thinner than 1 mm has therefore proven to be advantageous.
  • a layer thickness of 50 micrometers to 150 micrometers offers the sufficient thickness on the one hand to form a structure which is favorable for the ingrowth of the bone tissue and on the other hand a sufficient stability of the coating itself.
  • All biocompatible metals and metal alloys are suitable for coating. Alloys based on titanium, for example TiAI6V4 and TiAI6Nb7, have proven to be particularly advantageous on account of their thermal and mechanical properties.
  • All ceramic materials successfully used in prosthetics can be used as ceramic materials for the cup of the acetabular cup.
  • the aluminum oxide in appropriate purity has proven to be particularly advantageous for reasons of wear resistance, mechanical stability and medical compatibility.
  • the coating can be provided with a bioactive coating.
  • a known coating for this purpose is, for example, hydroxylapatite.
  • the coating is carried out in the same manner and in the same thickness as is used, for example, in the coating of the stems which are inserted into the thigh bones.
  • Figure 1 shows an inventive acetabular cup with a dense
  • Figure 2 is an inventive acetabular cup, the coating of which is porous, cut, and
  • Figure 3 is an enlarged view of the section through the coating of the
  • 1 denotes a total acetabular cup of a hip joint endoprosthesis.
  • the acetabular cup 1 is shown in section.
  • the ceramic bearing shell 2 has a hemispherical recess 3 for receiving the ball head.
  • the surface 4 of the ceramic body 2, which faces the hip bone, is rough.
  • the coating 5 has clawed into this rough surface 4. Since the metal or the metal alloy does not form a metallurgical or chemical connection with the ceramic material, good mechanical anchoring of the coating 5 is necessary.
  • the coating 5 is therefore to be applied in such a way that it fills all the valleys 7 of the surface 4 of the bearing shell 2 and covers all the peaks 8.
  • the coating made of metal or a metal alloy is tight.
  • Such a dense surface can be achieved, for example, by plasma spraying with correspondingly predetermined parameters, the flame temperature and the spacing of the spraying device, or, for example, by vapor deposition of several layers in a vacuum.
  • the coating 5 also has a rough surface 6.
  • the rough surface is intended to ensure that the implant is well anchored in the bone in that the bone substance fills the valleys 7 and the tips 8 overgrow.
  • the ingrowth into the bone substance can be accelerated by providing the coating with a bioactive coating, as is not shown here is how it is applied, for example, to stems of the hip joint endoprosthesis.
  • Figure 2 shows a further embodiment of an inventive
  • the section through the acetabular cup 11 shows a comparable ceramic bearing shell 2 with the same recess 3 for the ball head and with a comparable rough surface 4.
  • the structure 15 differs from the coating of the acetabular cup of the previous exemplary embodiment. The coating
  • a porous coating can be produced in particular by plasma spraying a metal or a metal alloy.
  • a titanium alloy TiAI6V4 is sprayed onto a ceramic bearing shell 2 made of aluminum oxide.
  • the coating 15 in the present exemplary embodiment consists of three layers 21, 22 sprayed on top of one another
  • the structure of the coating 15 present here can be produced by adjusting the temperature of the plasma flame and the distance of the spraying device from the surface of the pan.
  • the droplets 24 of the metal alloy strike the surface 4 of the ceramic bearing shell 2. Due to the liquid or pasty state of the metal droplets, the
  • the porosity of the coating 15 is achieved by adjusting the plasma spraying method accordingly.
  • the droplets do not form a dense layer on impact, but lie one above the other and next to one another, fusing or welding together at the contact surfaces 25 (FIG. 3). If a droplet already on the surface 4 is replaced by another
  • the coating 15 is sprayed on in several layers 21, 22 and 23, the described connection of the droplets to one another results in a porous layer, a coral structure, 24 pores or cavities 26 remaining between the individual droplets into which the bone tissue can grow in. This ensures good anchoring of the coating 15 and thus overall of the acetabulum 1 in the bone tissue.
  • the ingrowth behavior of the bone can, as not shown here, be further promoted by applying a bioactive layer, for example hydroxylapatite.
  • FIG. 3 shows an enlarged section of the coating 15 of the acetabular cup 11.
  • the individual droplets 24 can be clearly seen, partially or completely cut.
  • the droplets 24 of the first layer 21 have mechanically connected to the valleys 7 and the tips 8 of the rough surface of the ceramic material of the bearing shell 2.
  • the second layer 22 and the third layer 23 of the coating 15 are not only mechanically clamped together, but also on the contact surfaces 25 of the droplets 24, the droplets are metallurgically connected to one another by fusing, baking or welding.
  • the irregular structure of the droplets 24, which arises in particular due to the bursting of the droplets upon impact, likewise leads to pores and cavities 26. In addition to these pores and cavities, the bone tissue also has a good ingrowth on the overall rough surface 27 of the coating 15. and anchoring option.
  • part of the coating 15 is additionally provided with a bioactive coating
  • bioactive coatings for example of hydroxyapatite, are known and are usually applied by spraying, so that here, too, forms a surface structure that promotes ingrowth of the bone tissue.

Abstract

A hip-joint socket of a hip-joint endoprosthesis is provided, in which the bearing shell of the socket that mounts the ball head of the shaft is made of a ceramic material. The bearing shell (2) of the hip-joint socket (1; 11), in the region of its surface (4) with which it is inserted into the hip bone, is covered with a coating (5; 15) that is made of a biocompatible metal or a biocompatible metal alloy.

Description

Hüftgelenkspfanne Acetabular cup
Die Erfindung betrifft eine Hüftgelenkspfanne einer Hüftgelenk-Endoprothese entsprechend dem Oberbegriff des ersten Anspruchs.The invention relates to an acetabular cup of a hip joint endoprosthesis in accordance with the preamble of the first claim.
Hüftgelenk-Endoprothesen sind in der Regel modular aufgebaut. Sie bestehen beispielsweise aus einem Schaft, der in den Oberschenkelknochen eingesetzt wird. Auf den Schaft wird ein Kugelkopf aufgesteckt, der in einer aus zwei Teilen aufgebauten Pfanne gelagert wird. Die Pfanne besteht aus einem Pfannengehäuse, dem sogenannten Metal-back, und einem Pfanneneinsatz, dem sogenannten Insert. Es gibt auch noch Systeme, die noch mehr Kombinations- und Variationsmöglichkeiten zulassen, beispielsweise zum Verlängern des Schafts. Bei den modular aufgebauten Endoprothesen werden Implantatkomponenten unterschiedlicher Materialien und Größen miteinander verbunden. Beispielsweise werden Kugelköpfe aus Kobalt-Chrom auf einen Schaft aus Titanlegierung gesteckt oder ein Pfanneneinsatz aus Polyäthylen oder einem keramischen Werkstoff in ein Pfannengehäuse eingesetzt, wie es beispielsweise aus der DE 196 112 48 A1 bekannt ist. Die Kombination der einzelnen Teile wird in der Regel durch die Gelenkabmessungen vorgegeben.Hip joint endoprostheses are generally modular. For example, they consist of a shaft that is inserted into the thigh bone. A spherical head is attached to the shaft, which is stored in a pan made up of two parts. The pan consists of a pan housing, the so-called metal back, and a pan insert, the so-called insert. There are also systems that allow even more combination and variation options, for example to extend the shaft. In the modular endoprostheses, implant components of different materials and sizes are connected to each other. For example, ball heads made of cobalt-chrome are placed on a shaft made of titanium alloy, or a socket insert made of polyethylene or a ceramic material is inserted into a socket housing, as is known, for example, from DE 196 112 48 A1. The combination of the individual parts is usually determined by the joint dimensions.
Wie aus der Veröffentlichung „Frettingkorrosion, ein Problem bei Hüftendoprothesen" von G. Willmann, Praktische Orthopädie, Rheumatologie- Endoprothetik, Band 27, 1997, bekannt ist, ist bei dem modularen Aufbau der Endoprothesen nachteilig, daß nach dem Zusammensetzen durch die Belastungen im Körper Lockerungen auftreten können, die zur Relativbewegung zwischen den einzelnen Protheseteilen führen und damit Verschleiß hervorrufen. Darüber hinaus besteht auch aufgrund der Vielzahl der möglichen Komponenten und deren Zusammensetzungsmöglichkeiten die Gefahr einer Verwechslung hinsichtlich der Größen oder einer nicht bestimmungsgerechten Kombination von Prothesenkomponenten. Dieses kann zu Fehlfunktionen der Prothese und damit letztendlich zum Versagen führen. Aufgabe der vorliegenden Erfindung ist es, eine Hüftgelenkspfanne einer Hüftgelenk-Endoprothese vorzustellen, bei der sowohl eine falsche Zusammensetzung von Pfanneneinsatz und Pfannengehäuse ausgeschlossen als auch eine belastungsbedingte Lockerung der beiden Komponenten verhindert wird.As is known from the publication "Fretting corrosion, a problem with hip endoprostheses" by G. Willmann, Practical Orthopedics, Rheumatology Endoprosthetics, Volume 27, 1997, it is disadvantageous in the modular structure of the endoprostheses that after assembly by the stresses in the body Loosening can occur, which leads to the relative movement between the individual prosthesis parts and thus cause wear. In addition, due to the large number of possible components and their compositional possibilities, there is a risk of confusion in terms of sizes or an improper combination of prosthesis components Prosthesis and ultimately lead to failure. The object of the present invention is to present an acetabular cup of a hip joint endoprosthesis in which an incorrect composition of the socket insert and socket housing is excluded and a stress-related loosening of the two components is prevented.
Die Lösung der Aufgabe erfolgt mit Hilfe der kennzeichnenden Merkmale des ersten Anspruchs. Vorteilhafte Ausgestaltungen der Erfindung werden in den Unteransprüchen beansprucht.The problem is solved with the aid of the characterizing features of the first claim. Advantageous embodiments of the invention are claimed in the subclaims.
Durch die Erfindung entsteht eine einstückige Hüftgelenkspfanne als Implantat. Durch die Beschichtung des keramischen Werkstoffs der Pfanne mit einem biokompatiblen Metall oder einer biokompatiblen Metallegierung in dem Bereich, in dem die Pfanne in den Hüftknochen eingesetzt wird, entsteht eine unlösbare Verbindung zwischen dem Teil der Prothese, das nach dem Stand der Technik zur Lagerung des Kugelkopfs als Einsatz fungiert und dem sogenannten Pfannengehäuse, was die Verbindung zwischen dem Knochen und der Lagerschale für den Kugelkopf herstellt. Dem Chirurgen wird damit nur ein Teil für die Implantation einer Pfanne zur Verfügung gestellt, wobei die Beschichtung optimal auf Größe und Zusammensetzung der keramischen Lagerschale abgestimmt ist. Die Gefahr einer falschen Zusammensetzung von Pfanneneinsatz und Pfannengehäuse ist ausgeschlossen. Weiterhin ausgeschlossen ist die Gefahr, daß sich aufgrund der Belastungen in dem Prothesengelenk die Verbindung zwischen Einsatz und Gehäuse lockert und durch eine Relativbewegung der beiden Komponenten gegeneinander die Prothese verschleißt.The invention creates a one-piece acetabular cup as an implant. By coating the ceramic material of the socket with a biocompatible metal or a biocompatible metal alloy in the area in which the socket is inserted into the hip bones, an inseparable connection is created between the part of the prosthesis that, according to the prior art, is used to support the ball head acts as an insert and the so-called socket housing, which creates the connection between the bone and the bearing shell for the ball head. The surgeon is thus only provided with a part for the implantation of a cup, the coating being optimally matched to the size and composition of the ceramic bearing shell. The risk of incorrect assembly of the pan insert and pan housing is excluded. Also excluded is the risk that the connection between insert and housing will loosen due to the loads in the prosthesis joint and the prosthesis will wear out due to a relative movement of the two components against one another.
In vorteilhafter Ausgestaltung der Erfindung ist die zu beschichtende Oberfläche der Lagerschale der Hüftgelenkspfanne aufgerauht. Dadurch wird eine innige und feste mechanische Verbindung der Beschichtung mit dem Keramikkörper sichergestellt, da die Beschichtung weder chemisch noch metallurgisch mit der Keramik reagiert. Das Aufrauhen der Oberfläche des Keramikkörpers kann beispielsweise durch Strahlen mit Hartstoffpartikeln, durch Grobschleifen oder Ätzen erfolgen.In an advantageous embodiment of the invention, the surface of the bearing shell of the acetabular cup to be coated is roughened. This ensures an intimate and firm mechanical connection of the coating to the ceramic body, since the coating is neither chemically nor metallurgically associated with the Ceramic reacts. The surface of the ceramic body can be roughened, for example, by blasting with hard material particles, by coarse grinding or by etching.
Für das Auftragen der Beschichtung stehen insbesondere zwei bekannte und bewährte Verfahren zur Verfügung. Nach dem ersten Verfahren ist die Beschichtung aufgedampft. Das Aufdampfen kann beispielsweise durch Sputtern erfolgen. Dabei wird das aufzutragende Metall im Hochvakuum zerstäubt und scheidet sich aus der Dampfphase auf die Oberfläche des Substrats ab. Durch mehrfaches Aufdampfen kann eine Beschichtung von der erforderlichen Schichtdicke hergestellt werden.In particular, two known and proven methods are available for applying the coating. After the first process, the coating is evaporated. The vapor deposition can be done, for example, by sputtering. The metal to be applied is atomized in a high vacuum and deposits from the vapor phase on the surface of the substrate. A coating of the required layer thickness can be produced by multiple vapor deposition.
Die Beschichtung kann auch aufgespritzt sein. Zum Aufspritzen von Metallen oder Metallegierungen, insbesondere von den hochschmelzenden Metallen oder Metallegierungen des Titans, eignet sich das Plasmaspritzen.The coating can also be sprayed on. Plasma spraying is suitable for spraying on metals or metal alloys, in particular high-melting metals or metal alloys of titanium.
Das Plasmaspritzen bietet ebenfalls die Möglichkeit, eine Beschichtung in der erforderlichen Dicke herzustellen. Bei einer Beschichtung in genügender Dicke ist es möglich, die Oberfläche der Beschichtung aufzurauhen. Die Rauhigkeit kann durch das Auftragverfahren oder durch entsprechende Nachbearbeitung so herbeigeführt werden, daß sich dem Knochengewebe die Möglichkeit bietet, mit der Oberfläche zu verwachsen und somit eine sichere Verankerung des Implantats im Knochen zu bewirken. Die Beschaffenheit der Oberfläche kann insbesondere beim Plasmaspritzen bereits durch die Aufspritztechnik erreicht werden, so daß keine Nachbearbeitung erforderlich ist.Plasma spraying also offers the possibility of producing a coating in the required thickness. With a coating of sufficient thickness, it is possible to roughen the surface of the coating. The roughness can be brought about by the application process or by appropriate post-processing in such a way that the bone tissue has the possibility of growing together with the surface and thus causing the implant to be securely anchored in the bone. The quality of the surface can already be achieved by the spraying technique, in particular in the case of plasma spraying, so that no post-processing is required.
Eine besonders gute Verankerung des Implantats im Knochengewebe wird dann erreicht, wenn die Beschichtung porös ist. In diesem Fall kann das Knochengewebe in die Poren hineinwachsen und somit dem Implantat einen besonders guten Halt verschaffen. Die Dicke der Beschichtung muß so gewählt sein, daß sie einerseits dem Knochengewebe eine genügend große Angriffsfläche zum Verwachsen bietet, andererseits aber nicht in sich bruchgefährdet ist, was beispielsweise bei einer zu dicken porösen Beschichtung der Fall sein kann. Als vorteilhaft hat sich deshalb eine Schichtdicke herausgestellt, die dünner ist als 1 mm. Eine Schichtdicke von 50 Mikrometern bis 150 Mikrometern bietet einerseits die genügende Dicke, um eine für das Einwachsen des Knochengewebes günstige Struktur zu bilden und andererseits eine genügende Stabilität der Beschichtung in sich.The implant is particularly well anchored in the bone tissue if the coating is porous. In this case, the bone tissue can grow into the pores and thus give the implant a particularly good hold. The thickness of the coating must be selected so that on the one hand it offers the bone tissue a sufficiently large contact surface for growth, but on the other hand it is not at risk of breakage, which can be the case, for example, if the porous coating is too thick. A layer thickness that is thinner than 1 mm has therefore proven to be advantageous. A layer thickness of 50 micrometers to 150 micrometers offers the sufficient thickness on the one hand to form a structure which is favorable for the ingrowth of the bone tissue and on the other hand a sufficient stability of the coating itself.
Zur Beschichtung sind alle biokompatiblen Metalle und Metallegierungen geeignet. Als besonders vorteilhaft haben sich aufgrund ihrer thermischen und mechanischen Eigenschaften Legierungen auf der Basis von Titan, beispielsweise TiAI6V4 und TiAI6Nb7 erwiesen.All biocompatible metals and metal alloys are suitable for coating. Alloys based on titanium, for example TiAI6V4 and TiAI6Nb7, have proven to be particularly advantageous on account of their thermal and mechanical properties.
Als keramische Werkstoffe für die Lagerschale der Hüftgelenkspfanne können alle in der Prothetik erfolgreich angewendeten Keramikwerkstoffe eingesetzt werden. Als besonders vorteilhaft hat sich aus Gründen der Verschleißfestigkeit, der mechanischen Stabilität und der medizinischen Verträglichkeit das Aluminiumoxid in entsprechender Reinheit bewährt.All ceramic materials successfully used in prosthetics can be used as ceramic materials for the cup of the acetabular cup. The aluminum oxide in appropriate purity has proven to be particularly advantageous for reasons of wear resistance, mechanical stability and medical compatibility.
Um das Einwachsen des Implantats in den Knochen zu erleichtern und zu beschleunigen, kann die Beschichtung mit einem bioaktiven Überzug versehen sein. Ein für diese Zwecke bekannter Überzug ist beispielsweise Hydroxylapatit. Die Beschichtung erfolgt in der gleichen Weise und in der gleiche Dicke, wie sie beispielsweise bei der Beschichtung der Schäfte angewendet wird, die in den Oberschenkelknochen eingesetzt werden.In order to facilitate and accelerate the ingrowth of the implant in the bone, the coating can be provided with a bioactive coating. A known coating for this purpose is, for example, hydroxylapatite. The coating is carried out in the same manner and in the same thickness as is used, for example, in the coating of the stems which are inserted into the thigh bones.
An Hand von Ausführungsbeispielen wird die Erfindung näher erläutert.The invention is explained in more detail using exemplary embodiments.
Es zeigen: Figur 1 eine erfindungsgemäße Hüftgelenkspfanne mit einer dichtenShow it: Figure 1 shows an inventive acetabular cup with a dense
Beschichtung, deren Oberfläche aufgerauht ist, geschnitten,Coating, the surface of which is roughened, cut,
Figur 2 eine erfindungsgemäße Hüftgelenkspfanne, deren Beschichtung porös ist, geschnitten, undFigure 2 is an inventive acetabular cup, the coating of which is porous, cut, and
Figur 3 eine vergrößerte Ansicht des Schnitts durch die Beschichtung derFigure 3 is an enlarged view of the section through the coating of the
Hüftgelenkspfanne nach Figur 2.Hip socket according to Figure 2.
In Figur 1 ist mit 1 insgesamt eine Hüftgelenkspfanne einer Hüftgelenk- Endoprothese bezeichnet. Die Hüftgelenkspfanne 1 ist im Schnitt dargestellt. Die keramische Lagerschale 2 weist eine halbkugelförmige Ausnehmung 3 für die Aufnahme des Kugelkopfs auf. Die Oberfläche 4 des Keramikkörpers 2, die dem Hüftknochen zugewandt ist, ist rauh. In dieser rauhen Oberfläche 4 hat sich die Beschichtung 5 verkrallt. Da das Metall oder die Metallegierung keine metallurgische oder chemische Verbindung mit dem keramischen Werkstoff eingeht, ist eine gute mechanische Verankerung der Beschichtung 5 erforderlich. Die Beschichtung 5 ist deshalb so aufzutragen, daß sie möglichst alle Täler 7 der Oberfläche 4 der Lagerschale 2 ausfüllt und alle Spitzen 8 umhüllt. Im vorliegenden Ausführungsbeispiel ist die Beschichtung aus Metall oder einer Metallegierung dicht. Eine solche dichte Oberfläche kann beispielsweise durch Plasmaspritzen mit entsprechend vorgegebenen Parametern, der Flammentemperatur und des Abstands der Spritzeinrichtung, oder beispielsweise durch Aufdampfen mehrerer Schichten im Vakuum erreicht werden.In Figure 1, 1 denotes a total acetabular cup of a hip joint endoprosthesis. The acetabular cup 1 is shown in section. The ceramic bearing shell 2 has a hemispherical recess 3 for receiving the ball head. The surface 4 of the ceramic body 2, which faces the hip bone, is rough. The coating 5 has clawed into this rough surface 4. Since the metal or the metal alloy does not form a metallurgical or chemical connection with the ceramic material, good mechanical anchoring of the coating 5 is necessary. The coating 5 is therefore to be applied in such a way that it fills all the valleys 7 of the surface 4 of the bearing shell 2 and covers all the peaks 8. In the present exemplary embodiment, the coating made of metal or a metal alloy is tight. Such a dense surface can be achieved, for example, by plasma spraying with correspondingly predetermined parameters, the flame temperature and the spacing of the spraying device, or, for example, by vapor deposition of several layers in a vacuum.
Die Beschichtung 5 weist ebenfalls eine rauhe Oberfläche 6 auf. Die rauhe Oberfläche soll eine gute Verankerung des Implantats im Knochen bewirken, indem die Knochensubstanz die Täler 7 ausfüllt und die Spitzen 8 umwächst. Das Einwachsen in die Knochensubstanz kann dadurch beschleunigt werden, daß, wie hier nicht dargestellt ist, die Beschichtung mit einem bioaktiven Überzug versehen ist, wie er beispielsweise bei Schäften der Hüftgelenk-Endoprothesen aufgetragen wird.The coating 5 also has a rough surface 6. The rough surface is intended to ensure that the implant is well anchored in the bone in that the bone substance fills the valleys 7 and the tips 8 overgrow. The ingrowth into the bone substance can be accelerated by providing the coating with a bioactive coating, as is not shown here is how it is applied, for example, to stems of the hip joint endoprosthesis.
Figur 2 zeigt ein weiteres Ausführungsbeispiel einer erfindungsgemäßenFigure 2 shows a further embodiment of an inventive
5 Hüftgelenkspfanne 11. Der Schnitt durch die Hüftgelenkspfanne 11 zeigt eine vergleichbare keramische Lagerschale 2 mit der gleichen Ausnehmung 3 für den Kugelkopf und mit einer vergleichbaren rauhen Oberfläche 4. Die Beschichtung 15 unterscheidet sich allerdings im Aufbau von der Beschichtung der Hüftgelenkspfanne des vorhergehenden Ausführungsbeispiels. Die Beschichtung5 acetabular cup 11. The section through the acetabular cup 11 shows a comparable ceramic bearing shell 2 with the same recess 3 for the ball head and with a comparable rough surface 4. However, the structure 15 differs from the coating of the acetabular cup of the previous exemplary embodiment. The coating
10 15 ist porös. Eine poröse Beschichtung kann insbesondere durch Plasmaspritzen eines Metalls oder einer Metallegierung erzeugt werden. Im vorliegenden Ausführungsbeispiel ist auf eine keramische Lagerschale 2 aus Aluminiumoxid eine Titanlegierung TiAI6V4 aufgespritzt. Die Beschichtung 15 besteht im vorliegenden Ausführungsbeispiel aus drei übereinandergespritzten Lagen 21 , 2210 15 is porous. A porous coating can be produced in particular by plasma spraying a metal or a metal alloy. In the present exemplary embodiment, a titanium alloy TiAI6V4 is sprayed onto a ceramic bearing shell 2 made of aluminum oxide. The coating 15 in the present exemplary embodiment consists of three layers 21, 22 sprayed on top of one another
15 und 23. Durch Einstellung der Temperatur der Plasmaflamme sowie des Abstands der Spritzeinrichtung von der Oberfläche der Pfanne kann die hier vorliegende Struktur der Beschichtung 15 erzeugt werden. Die Tröpfchen 24 der Metallegierung treffen auf die Oberfläche 4 der keramischen Lagerschale 2 auf. Aufgrund des flüssigen oder teigigen Zustands der Metalltröpfchen werden die15 and 23. The structure of the coating 15 present here can be produced by adjusting the temperature of the plasma flame and the distance of the spraying device from the surface of the pan. The droplets 24 of the metal alloy strike the surface 4 of the ceramic bearing shell 2. Due to the liquid or pasty state of the metal droplets, the
20 Täler 7 der Oberfläche 4 ausgefüllt und die Spitzen 8 umschlossen. Dadurch, daß das Metall oder die Metallegierung mit der Keramik nicht reagiert, erfolgt beim Abkühlen der Tröpfchen 24 eine mechanische Verklammerung der Beschichtung 15 mit der Oberfläche 4 der keramischen Lagerschale 2.20 valleys 7 of the surface 4 filled and the peaks 8 enclosed. Because the metal or the metal alloy does not react with the ceramic, when the droplets 24 cool, the coating 15 is mechanically clamped to the surface 4 of the ceramic bearing shell 2.
25 Die Porosität der Beschichtung 15 wird durch eine entsprechende Einstellung des Plasma-Spritzverfahrens erreicht. Die Tröpfchen bilden beim Auftreffen keine dichte Schicht, sondern legen sich übereinander und nebeneinander, wobei sie an den Berührungsflächen 25 (Fig. 3) miteinander verschmelzen oder verschweißen. Wird ein bereits auf der Oberfläche 4 befindliches Tröpfchen durch ein anderes,25 The porosity of the coating 15 is achieved by adjusting the plasma spraying method accordingly. The droplets do not form a dense layer on impact, but lie one above the other and next to one another, fusing or welding together at the contact surfaces 25 (FIG. 3). If a droplet already on the surface 4 is replaced by another
30 frisches Tröpfchen getroffen, so kann an der Auftreffstelle aufgrund der mitgeführten Wärmeenergie des frischen Tröpfchens die Oberfläche des ersten Tröpfchens wieder aufgeschmolzen werden und eine entsprechende Verbindung der beiden Tröpfchen an der Berührungsfläche entstehen. Wird, wie im vorliegenden Ausführungsbeispiel, die Beschichtung 15 in mehreren Lagen 21 , 22 und 23 aufgespritz, entsteht durch die beschriebene Verbindung der Tröpfchen untereinander eine poröse Schicht, eine Korallenstruktur, wobei zwischen den einzelnen Tröpfchen 24 Poren bzw. Hohlräume 26 verbleiben, in die das Knochengewebe einwachsen kann. Dadurch wird eine gute Verankerung der Beschichtung 15 und damit insgesamt der Hüftgelenkspfanne 1 im Knochengewebe erreicht. Das Einwachsverhalten des Knochens kann, wie hier nicht dargestellt, durch Aufbringen einer bioaktiven Schicht, beispielsweise Hydroxylapatit, weiterhin begünstigt werden.30 fresh droplets hit, so the surface of the first one can at the point of impact due to the entrained thermal energy of the fresh droplet Droplets are melted again and a corresponding connection of the two droplets is formed on the contact surface. If, as in the present exemplary embodiment, the coating 15 is sprayed on in several layers 21, 22 and 23, the described connection of the droplets to one another results in a porous layer, a coral structure, 24 pores or cavities 26 remaining between the individual droplets into which the bone tissue can grow in. This ensures good anchoring of the coating 15 and thus overall of the acetabulum 1 in the bone tissue. The ingrowth behavior of the bone can, as not shown here, be further promoted by applying a bioactive layer, for example hydroxylapatite.
Figur 3 zeigt einen vergrößerten Ausschnitt aus der Beschichtung 15 der Hüftgelenkspfanne 11. Deutlich zu sehen sind die einzelnen Tröpfchen 24, teilweise oder ganz geschnitten. Die Tröpfchen 24 der ersten Lage 21 haben sich mechanisch mit den Tälern 7 und den Spitzen 8 der rauhen Oberfläche des Keramikwerstoffs der Lagerschale 2 verbunden. Die zweite Lage 22 und die dritte Lage 23 der Beschichtung 15 hat sich nicht nur mechanisch miteinander verklammert sondern an den Berührungsflächen 25 der Tröpfchen 24 sind die Tröpfchen durch Verschmelzen, Verbacken oder Verschweißen auch metallurgisch miteinander verbunden. Die unregelmäßige Struktur der Tröpfchen 24, die insbesondere durch das Aufplatzen der Tröpfchen beim Auftreffen entsteht, führt ebenfalls zu Poren und Hohlräumen 26. Zusätzlich zu diesen Poren und Hohlräumen bietet sich dem Knochengewebe auch an der insgesamt rauhen Oberfläche 27 der Beschichtung 15 eine gute Einwachs- und Verankerungsmöglichkeit.FIG. 3 shows an enlarged section of the coating 15 of the acetabular cup 11. The individual droplets 24 can be clearly seen, partially or completely cut. The droplets 24 of the first layer 21 have mechanically connected to the valleys 7 and the tips 8 of the rough surface of the ceramic material of the bearing shell 2. The second layer 22 and the third layer 23 of the coating 15 are not only mechanically clamped together, but also on the contact surfaces 25 of the droplets 24, the droplets are metallurgically connected to one another by fusing, baking or welding. The irregular structure of the droplets 24, which arises in particular due to the bursting of the droplets upon impact, likewise leads to pores and cavities 26. In addition to these pores and cavities, the bone tissue also has a good ingrowth on the overall rough surface 27 of the coating 15. and anchoring option.
In Figur 3 ist ein Teil der Beschichtung 15 zusätzlich mit einem bioaktiven ÜberzugIn FIG. 3, part of the coating 15 is additionally provided with a bioactive coating
28 beschichtet. Diese bioaktiven Überzüge, beispielsweise aus Hydroxylapatit, sind bekannt und werden in der Regel durch Spritzen aufgetragen, so daß sich auch hier eine Oberflächenstruktur bildet, die das Einwachsen des Knochengewebes begünstigt. 28 coated. These bioactive coatings, for example of hydroxyapatite, are known and are usually applied by spraying, so that here, too, forms a surface structure that promotes ingrowth of the bone tissue.

Claims

Patentansprüche claims
Hüftgelenkspfanne einer Hüftgelenk-Endoprothese, bei der die den Kugelkopf des Schaftes lagernde Lagerschale der Pfanne aus einem keramischen Werkstoff besteht, dadurch gekennzeichnet, daß die Lagerschale (2) der Hüftgelenkspfanne (1 ; 11 ) in dem Bereich ihrer Oberfläche (4), mit dem sie in den Hüftknochen eingesetzt wird, mit einer Beschichtung (5; 15) aus einem biokompatiblen Metall oder einer biokompatiblen Metallegierung überzogen ist.Hip joint socket of a hip joint endoprosthesis, in which the bearing shell of the socket supporting the spherical head of the socket consists of a ceramic material, characterized in that the bearing shell (2) of the hip joint socket (1; 11) in the area of its surface (4) with which it is inserted into the hip bone and is coated with a coating (5; 15) made of a biocompatible metal or a biocompatible metal alloy.
Hüftgelenkspfanne nach Anspruch 1 , dadurch gekennzeichnet, daß die zu beschichtende Oberfläche (4) der Lagerschale (2) der Hüftgelenkspfanne (1 ; 11 ) zur Haftverbesserung der Beschichtung (5; 15) aufgerauht ist.Hip joint socket according to claim 1, characterized in that the surface (4) of the bearing shell (2) of the hip joint socket (1; 11) to be coated is roughened to improve the adhesion of the coating (5; 15).
3. Hüftgelenkspfanne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Beschichtung (5) aufgedampft ist.3. acetabular cup according to claim 1 or 2, characterized in that the coating (5) is evaporated.
4. Hüftgelenkspfanne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Beschichtung (15) aufgespritzt ist.4. acetabular cup according to claim 1 or 2, characterized in that the coating (15) is sprayed on.
5. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Beschichtung (15) aus mehreren Lagen (21 , 22, 23) besteht.5. acetabular cup according to one of claims 1 to 4, characterized in that the coating (15) consists of several layers (21, 22, 23).
6. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Beschichtung (5; 15) auf ihrer Oberfläche (6; 27) rauh ist.6. acetabular cup according to one of claims 1 to 5, characterized in that the coating (5; 15) on its surface (6; 27) is rough.
7. Hüftgelenkspfanne nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Beschichtung (15) porös ist. 7. acetabular cup according to one of claims 4 to 6, characterized in that the coating (15) is porous.
8. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Dicke der Beschichtung (5; 15) dünner als 1 mm ist.8. acetabular cup according to one of claims 1 to 7, characterized in that the thickness of the coating (5; 15) is thinner than 1 mm.
9. Hüftgelenkspfanne nach Anspruch 8, dadurch gekennzeichnet, daß die Dicke der Beschichtung (5; 15) zwischen 50 Mikrometern und 150 Mikrometern liegt.9. acetabular cup according to claim 8, characterized in that the thickness of the coating (5; 15) is between 50 microns and 150 microns.
10. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Beschichtung (5; 15) aus einer Titanlegierung besteht.10. acetabular cup according to one of claims 1 to 9, characterized in that the coating (5; 15) consists of a titanium alloy.
11. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die Beschichtung (5; 15) mit einem bioaktiven Überzug (28) versehen ist.11. acetabular cup according to one of claims 1 to 10, characterized in that the coating (5; 15) is provided with a bioactive coating (28).
12. Hüftgelenkspfanne nach einem der Ansprüche 1 bis 11 , dadurch gekennzeichnet, daß die Lagerschale (2) der Hüftgelenkspfanne (1 ) aus Aluminiumoxid besteht. 12. acetabular cup according to one of claims 1 to 11, characterized in that the bearing shell (2) of the acetabular cup (1) consists of aluminum oxide.
EP98965817A 1997-12-13 1998-12-12 Hip joint socket Expired - Lifetime EP1052949B1 (en)

Applications Claiming Priority (3)

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DE19755536 1997-03-13
DE19755536A DE19755536A1 (en) 1997-12-13 1997-12-13 Acetabular cup
PCT/EP1998/008110 WO1999030634A2 (en) 1997-12-13 1998-12-12 Hip joint socket

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EP1052949A1 true EP1052949A1 (en) 2000-11-22
EP1052949B1 EP1052949B1 (en) 2003-05-28

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EP98965817A Expired - Lifetime EP1052949B1 (en) 1997-12-13 1998-12-12 Hip joint socket

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US (1) US6319285B1 (en)
EP (1) EP1052949B1 (en)
JP (1) JP2002508208A (en)
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CA (1) CA2314497A1 (en)
DE (2) DE19755536A1 (en)
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Also Published As

Publication number Publication date
JP2002508208A (en) 2002-03-19
EP1052949B1 (en) 2003-05-28
CA2314497A1 (en) 1999-06-24
WO1999030634A2 (en) 1999-06-24
ATE241326T1 (en) 2003-06-15
US6319285B1 (en) 2001-11-20
DE19755536A1 (en) 1999-06-17
WO1999030634A3 (en) 2000-10-05
DE59808551D1 (en) 2003-07-03

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